Abstract
We previously reported that a rare sugar d-allose, which is the d-glucose epimer at C3, inhibits the gibberellin-dependent responses such as elongation of the second leaf sheath and induction of α-amylase in embryo-less half seeds in rice (Fukumoto et al. 2011). d-Allose suppresses expressions of gibberellin-responsive genes downstream of SLR1 protein in the gibberellin-signaling through hexokinase (HXK)-dependent pathway. In this study, we discovered that d-allose induced expression of ABA-related genes including OsNCED1-3 and OsABA8ox1-3 in rice. Interestingly, d-allose also up-regulated expression of OsABF1, encoding a conserved bZIP transcription factor in ABA signaling, in rice. The d-allose-induced expression of OsABF1 was diminished by a hexokinase inhibitor, d-mannoheptulose (MNH). Consistently, d-allose also inhibited Arabidopsis growth, but failed to trigger growth retardation in the glucose-insensitive2 (gin2) mutant, which is a loss-of-function mutant of the glucose sensor AtHXK1. d-Allose activated AtABI5 expression in transgenic gin2 over-expressing wild-type AtHXK1 but not in gin2 over-expressing the catalytic mutant AtHXK1S177A, indicating that the d-allose phosphorylation by HXK to d-allose 6-phosphate (A6P) is the first step for the up-regulation of AtABI5 gene expression as well as d-allose-induced growth inhibition. Moreover, overexpression of OsABF1 showed increased sensitivity to d-allose in rice. These findings indicated that the phosphorylation of d-allose at C6 by hexokinase is essential and OsABF1 is involved in the signal transduction for d-allose-induced growth inhibition.
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Abbreviations
- ABA:
-
Abscisic acid
- A6P:
-
d-Allose 6-phosphate
- GA:
-
Gibberellin
- gin2 :
-
Glucose-insensitive2
- HXK:
-
Hexokinase
- MNH:
-
d-Mannoheptulose
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Acknowledgments
We thank Rice Genome Resource Center at National Institute of Agrobiological Sciences (NIAS, Tsukuba, Japan) for providing full-length cDNA used in this study. This study was supported by the Programme for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry.
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425_2013_1853_MOESM1_ESM.tif
Supplemental Fig. S1 Effect of 6-deoxy-d-allose on growth rate of rice seedlings. One microliter of 6-deoxy-d-allose (6-DA) solutions (10, 100, 500 and 1000 mM) was applied as the same methods described in Fig 1. The second sheath and shoot lengths were measured at 6 days after treatment, and compared to that of the water-treated control. All plants were grown at 25°C in growth chambers after the sugar treatment. Each datum is the average of 20 seedlings with SD values, and no statistical differences (P<0.05) found among respective data as indicated by same letter (TIFF 156 kb)
425_2013_1853_MOESM2_ESM.tif
Supplemental Fig. S2 HPLC detection of d-allose and d-allose 6-phosphate in extracts from Arabidopsis leaves. Total protein was extracted from plants (100 mg FW) of wild type Arabidopsis (WT), gin2 mutant, transgenic gin2 plant over-expressing normal AtHXK (gin2/35S::AtHXK1), and transgenic gin2 plant over-expressing point mutated AtHXK1 at S177A (gin2/35S::S177A) as described in Fig. 5, which was grown for 10 days on MS medium supplemented with 1 % sucrose. d-Allose and A6P were detected after coupled with p-aminobenzoic ethyl ester (ABEE) by the method of Yasuno et al. (1997) with modifications (TIFF 356 kb)
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Fukumoto, T., Kano, A., Ohtani, K. et al. Phosphorylation of d-allose by hexokinase involved in regulation of OsABF1 expression for growth inhibition in Oryza sativa L.. Planta 237, 1379–1391 (2013). https://doi.org/10.1007/s00425-013-1853-9
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DOI: https://doi.org/10.1007/s00425-013-1853-9